产品概述
描述
ST25R3920B是一种车规级高性能NFC通用器件，支持NFC发起设备、NFC目标、NFC读卡器和NFC卡模拟模式。
ST25R3920B为CCC（车联网联盟）数字钥匙应用而设计，可为车门把手或中控台等领域的汽车进入/启动应用快速开发产品，并具有配对、NFC卡保护以及Qi充电器等附加功能。由于非常坚固且具有高噪音容忍度，同时还能减少电磁辐射，因此，该器件甚至可以在恶劣条件下正常工作，从而使认证过程更加轻松。
该器件包括高级模拟前端 (AFE) 和高度集成的数据成帧系统，可用于ISO18092有源和无源发起设备、ISO18092有源和无源目标、NFC-A/B (ISO14443A/B) 读卡器（包括更高比特率）、NFC-F (FeliCa™) 读卡器、NFC-V (ISO15693) 读卡器（高达53 kbps）、NFC-A/NFC-F卡模拟。
AFE和数据成帧系统的特殊Stream和Transparent模式用以在读卡器或卡模拟模式下实现其他自定义协议。
ST25R3920B具有高射频功率和动态功率输出，可直接高效驱动天线，即使是在门把手中常见的小尺寸天线，也能实现较大的交互距离。该器件包含附加功能，因此特别适用于低功耗应用。它通过测量天线信号的振幅或相位，同时将功耗降至最低，实现低功耗卡检测。
ST25R3920B的设计具有较宽的电源电压范围（-40 °C至+105 °C为2.6至5.5 V，-20 °C至+105 °C为2.4至5.5 V）和较宽的外设IO电压范围（1.65至5.5 V）。
该器件具有高射频输出功率、低功耗模式、宽电源范围和AEC-Q100 2级认证，是汽车应用的理想选择。
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所有功能
- 符合AEC-Q100标准
- 工作模式
- 读卡器/写卡器
- 卡模拟
- 有源和无源点对点
- RF通信
- 符合EMVCo® 3.1a模拟和数字标准
- NFC-A / ISO14443A，高达848 Kb/s
- NFC-B / ISO14443B，高达848 Kb/s
- NFC-F / FeliCa™，高达424 Kb/s
- NFC-V / ISO15693，高达53 Kb/s
- NFC-A / ISO14443A (106 Kb/s) 和NFC-F / FeliCa™ (212/424 Kb/s) 卡模拟
- 有源和无源点对点发起方和目标模式，高达424 Kb/s
- 底层模式实现了兼容MIFARE Classic®或其他自定义协议
- 主要特性
- 动态功率输出 (DPO) 控制场强度，将其保持在给定范围内
- 主动波束成形 (AWS) 减少过冲和下冲
- 噪声抑制接收器 (NSR) 可在噪声环境中进行接收
- 通过可变电容实现自动天线调谐 (AAT)
- 集成符合EMVCo® 3.1a标准的EMD处理
- 自动增益控制和静噪功能，可最大化SNR
- 低功耗NFC有源和无源目标模式
- 可调ASK调制深度，从0到82%
- 集成稳压器，可提升系统PSRR
- AM/PM和I/Q解调器，提供基带通道求和或自动通道选择功能
- 可驱动两根独立的单端天线
- 测量天线电压振幅和相位、RSSI、片上电源和稳压值
- 外部通信接口
- 512字节FIFO
- SPI接口，高达5 Mb/s
- I2C，高达400 Kb/s（快速模式下），1 Mb/s（极速模式下）及3.4 Mb/s（高速模式下）
- 电气特性
- 宽电源电压和环境温度范围（-40 °C至+105 °C为2.6至5.5 V，-20 °C至+105 °C为2.4至5.5 V）
- 宽外设通信电压范围：1.65至5.5 V
- 石英振荡器，使用27.12 MHz晶振，可快速启动
eDesignSuite
eDesignSuite is a comprehensive set of easy-to-use design-aid utilities ready to help you streamline the system development process with a wide range of ST products.
Power Management Design Center
Thermal-electrical Simulators for Components
Signal Conditioning Design Tool
NFC/RFID Calculators
Choose design tool: 
Power Management Design Center
Power Supply Design Tool
• SMPS design, by topology, by type and by product
• PFC design with analog and digitial control
• Supports various PCB configurations
Choose type: DC/DC AC/DC 太阳能电池充电器
Power Management Design Center
LED Lighting Design Tool
• Handles AC-DC and DC-DC design in common topologies
• Displays interactive and annotated schematic
• Provides current/voltage graphs, Bode plots, efficiency curves and power-loss data
Choose type: DC/DC AC/DC
Power Management Design Center
Digital Power Workbench
• Provides a step-by-step optimized design of power section and control loop
• Generates the STM32Cube embedded software package for custom applications and allows firmware project generation, compatible with multiple STM32 IDEs
Power Management Design Center
Power Tree Designer
• Specify input/output power for each node in the tree
• Check for consistency
• Design each individual node
Choose design tool: 
Thermal-electrical Simulators for Components
AC Switches Simulator
• Select ratings and application waveforms
• Get junction temperature and blocking voltage graphs
• Search and sort suitable devices
Thermal-electrical Simulators for Components
Rectifier Diodes Simulator
• Select ratings and application waveforms
• Estimate power losses
• Search and sort suitable devices
Thermal-electrical Simulators for Components
STPOWER Studio
• Supports long mission profiles
• Provides power loss and temperature graphs
• Helps define heatsink thermal properties
Thermal-electrical Simulators for Components
Twister Sim
• Help select the right ViPOWER Automotive power device
• Supports load-compatibility, wiring harness optimization, fault condition impact and diagnostic analysis
• Supports various PCB configurations
Thermal-electrical Simulators for Components
TVS Simulator
• Specify system ratings and surge waveform
• Search and sort suitable devices
Thermal-electrical Simulators for Components
Estimate
• Build simple schematics and firmware inputs in minutes
• Quickly generate reliable estimates of battery life, system power consumption and bill of materials costs
Choose design tool: 
Signal Conditioning Design Tool
Active Filters
• Handles multi-stage-designs and common topologies
• Returns circuit component values
• Provides gain, phase and group delay graphs
• Low Pass, High Pass and Band Pass
Signal Conditioning Design Tool
Comparators
• Handles most common configurations
• Returns circuit components values
• Provides I/O signal waveforms
• Inverting, Non Inverting, Window
Signal Conditioning Design Tool
Low side Current Sensing
• Returns circuit component values
• Provides current error graphs
Signal Conditioning Design Tool
High side Current Sensing
• Provides current error graphs.
• Help to select the right High side current sensing and shunt devices.
Choose design tool: 
NFC/RFID Calculators
NFC Inductance
• Input geometry and substrate properties
• Get antenna impedance
NFC/RFID Calculators
UHF Link Budget
• Enter forward and reverse link characteristics
• The tool returns link budget estimate
NFC/RFID Calculators
NFC Tuning Circuit
• Enter antenna parameter and matching target
• Select the topology of the matching network
• The tool returns component values for the desired design targets
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STMicroelectronics - ST25R3920B
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